The city and the countryside are places of vital importance of the Greek reality. Although the city succeeded over the countryside along centuries, it hasn’t been detached from it. The earth, apart from man, gave birth to all the necessary means in order for him to be able to survive and evolve. The public markets, that even today retain the glamor of previous years, are the places of connection of this apparent gap between the countryside and the city. Meeting places, public places where every citizen can be willingly active. They are part of the Greek life and tradition. That's why they remain so important. But what is of great interest in them, is that one can find in them the place of origin of the products, the journey of production, the land, the people.

 Therefore, as far as the popular market of Trikala is concerned, we mentally travelled through time. We followed Fernand Braudel’s paths in the Mediterranean. We observed Gramsci's theories and Hatzimichalis' record of modern Europe and its people. The uneven geographical development that reached the peoples of Southern Europe in poverty while those of the North in the accumulation of wealth. André Gorz’s redevelopment among other theorists, helped us see the popular market from different perspectives. To find opportunities and to use the Greek land. And finally, we returned to Trikala; but this time with a broader look at the place, the people, the products. The present study aims to examine the potential for self-sufficiency and the revitalization of the city through sustainable development, is the production of biogas from Anaerobic Digestion of waste and residues produced by local crops, the local animal stock and their treatment and its application in settlements.